mesa: Update to current oe-core mesa version 9.1.6
mesa: Update to current oe-core mesa version 9.1.6

The previous version is not available anymore, so use the newer
version of the mesa recipe now.

Signed-off-by: Darren Hart <38f9eaa30910c40b06f5a60020b1222f2a953801@linux.intel.com>

koenkooi/meta-minnow,koenkooi/meta-minnow